Symbol
Explanation
Dimension
Unit,
See
for example
page
fxi,N
fraction of nitrogen
MN· Mx- 1
kgTNikgCOD
49
in suspended inert
matter
FG
degree of flocculation
327
G
mean velocity gradient r1
s-1
326
DG 0 (W)
Gibb's free energy
M· L 2 -r 2 . kJie-eqv
at 25°C, pH = 7 and an e-eqv -1
activity of 1
h
transfer coefficient
L-r 1
mid
154
pH Monod constant
73
KB
floc degradation con- varying
varying
327
stant for iron, alu(often: T)
(often: s)
minium or calcium
phosphorus precipitation
KB'
floc degradation
varying
(number of primary
327
constant
(often:
particles sloughed off
T-L-~
from floes · s)lm 3 floes
kE
hydrolysis constant
184
Ktr
Freundlich isotherm
varying
varying
331
constant
kh
hydrolysis constant
r1
d-1
64
(first order kinetics)
kHAc
acetic acid constant in M-~1.r1 kg COD I (kg bio98
biological phosphorus
mass· d)
removal
kp
acetate pick-up conM-L- 3 -r 1 kg CODI(m 3 ·d)
274
stant
khX
hydrolysis constant
M·~1-d-1 kg COD(S) I (kg COD(B) ·
64
(saturation kinetics)
d)
357